Mazda Workshop Service and Repair Manuals

Spark Plug: Testing and Inspection

Spark Plug Inspection

Check these points. If a problem is found, replace the plug:

^ Damaged insulation
^ Worn electrodes
^ Carbon deposits
^ Damaged gasket
^ Burned tip

Set plug gap to 0.040 - 0.043 in (1.0 - 1.1 mm).